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Let's say there is a (road-rage based) physical fight in the street. It is not a bad fight and no injuries. It ends in one car fleeing on a red light, and the two other people getting back in their cars and staying stopped at the red light.

Neither parties called 911.

If a witness had called 911 during the incident, but nobody involved called 911, could someone still be cited or charged with a crime? Would the police take the witnesses license plate information (if given) and look up the individuals involved and track them down to charge them? Or would it not be an issue because neither party called the police and the event is over?

Police and prosecutors can act on information from witnesses, regardless of whether anyone involved asks for their help. There's no good reason to require a complaint from a participant, and plenty of good reasons not to.